Pakistan, Aug. 14 -- Following the tragic passing of the talent manager-who shared kids River Rose, 11, and Remington "Remy" Alexander, 9, with ex-wife Kelly Clarkson-at 48, his cause of death was determined to be natural causes related to a diagnosis of melanoma, Silver Bow County Coroner Dan Hollis confirmed to E! News.

"Brandon Blackstock passed away peacefully at his home in Butte, Montana on August 7th," he shared, "under hospice care surrounded by his family."

On Aug. 7, a rep for Brandon-who is also dad to kids Savannah Blackstock and Seth Blackstock, with his ex-wife Melissa Ashworth-confirmed his untimely death after a yearslong battle with a then-unspecified form of cancer.

"It is with great sadness that we share the news tha...